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From Sébastien Brisard (JIRA) <j...@apache.org>
Subject [jira] [Commented] (MATH-655) General framework for iterative algorithms
Date Fri, 02 Sep 2011 13:58:09 GMT

    [ https://issues.apache.org/jira/browse/MATH-655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095987#comment-13095987
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Sébastien Brisard commented on MATH-655:
----------------------------------------

No, sorry I wasn't very clear.
I just mean that for the time being, {{IterativeLinearSolver}} extends {{IterativeAlgorithm}}.
What I'll do, is copy/paste all methods from {{IterativeAlgorithm}} into {{IterativeLinearSolver}},
and remove the abstract class {{IterativeAlgorithm}}.
So {{IterativeLinearSolver}} would still have methods to fire events, update the iteration
count, etc... Only these methods would be part of {{IterativeLinearSolver}}, and not of a
(too-general) super-class.
Then, I think it will always be possible to go back at a later point, and re-extract those
methods so as to re-create a super-class.
Am I wrong? I think the event handling is fairly lightweight, but you're right, it might be
utterly wrong in the end. I could just set this aside for the time being, as well as custom
stopping criteria (as you suggested, a default stopping criterion is now hard-coded in the
linear solver itself).

> General framework for iterative algorithms
> ------------------------------------------
>
>                 Key: MATH-655
>                 URL: https://issues.apache.org/jira/browse/MATH-655
>             Project: Commons Math
>          Issue Type: New Feature
>    Affects Versions: 3.0
>            Reporter: Sébastien Brisard
>            Priority: Minor
>              Labels: algorithm, events
>         Attachments: iterative-algorithm.zip
>
>
> Following the thread [Monitoring iterative algorithms|http://mail-archives.apache.org/mod_mbox/commons-dev/201108.mbox/%3CCAGRH7HrgcgoBA=jcoKovjiQU=TjpQHnspBkOGNCu7oDdKk=K4w@mail.gmail.com%3E],
here is a first attempt at defining a general enough framework for iterative algorithms at
large. At the moment, the classes provide support for
> * maximum number of iterations
> * events handling
> ** initialization event (prior to entering the main loop),
> ** iteration event (after completion of one iteration),
> ** termination event (after termination of the main loop).
> These classes do not yet provide support for a stopping criterion.
> Some points worth to note
> * For the time being, the classes are part of the o.a.c.m.linear package.
> * For the time being, {{IterativeAlgorithm.incrementIterationCount()}} throws a {{TooManyEvaluationsException}}.
If the proposed new feature is integrated into CM, then a proper {{TooManyIterationsException}}
should be created, from which the former could derive.

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